title: Persistence Time of the Ring of Bubbles (PTRB): a method for the quantification of the Foam Tests.
mesh_terms: D000649:Amniocentesis; D000653:Amniotic Fluid / Q000032:analysis*; D005260:Female; D005325:Fetal Organ Maturity; D006801:Humans; D007231:Infant, Newborn; D008168:Lung / Q000196:embryology*; D010713:Phosphatidylcholines / Q000032:analysis*; D011247:Pregnancy; D011248:Pregnancy Complications; D011254:Pregnancy in Diabetics; D012127:Respiratory Distress Syndrome, Newborn / Q000517:prevention & control*; D012204:Rh-Hr Blood-Group System; D013109:Sphingomyelins / Q000032:analysis*
chemical_list: D010713:Phosphatidylcholines; D012204:Rh-Hr Blood-Group System; D013109:Sphingomyelins